Slush pump valve



such parts are replaceable.

Patented-Se t. 14,1943 I zszssre swsn rum vanva 'carlm.

American Well AndersomOorsicana, 'lexs assigiior to & PromectingCompany,

Corsican, Ten, a corporation Application January 27, 194:; Serial No.423,341

3 Claims. (Cl. 251-127) This invention relates to a valve, and moreparticularly to a novel form of valve especially adapted for use in highpressure pumps for abrasive'carrying fluids such as mud pumps employedfor pumping drilling fluid in the rotary method of drilling deep wells.

In pmnps of the type used in the drilling of deep wells it is necessaryto provide valves which are capable of withstanding heavy pressures andresisting wear and the effects of heavy impacts for long periods oftime. At the same time, such valves must operate efliciently inproducing a seal against leakage through the valve of fluid beingpumped.

It is an object of the invention to provide a valve in which theengageable and relatively movable parts may be replaced when worn.

It is also an object to provide a valve having replaceablewear-resistant parts of small cross section whereby the volume ofmaterial comprising such parts is minimized.

The enlarged portion is reduced at II whereby there is provided a flangeit which is engaged by the upper face of the packing rins' An annularwear plate I. of wear-resistant material .such as metal, harder rubberor other compositions, also surrounds the reduced portion I! .of

' 2| which engages a retainer plate 22 which in turn engages the wearplate ll so that the assem- Another object is to providea valve having apacking gasket and wear plate with substantially.

contiguous surfaces adapted to, engage the valve seat to arrest themovement of the valve and to form a seal between the seat and the valvewhere The foregoing are primary objects which, together with otherobjects, will be more fully apparent from a consideration of thefollowing description taken in connection with the accompanying drawingin which: i

Fig. 1 is an eievatio'nal view partly in section showing a valveconstruction embodying the invention;

Fig. 2 is a sectional view taken on the line 2-2 in Fig. 1;

Fig. 3 is a plan view of the packing gasket comprising an element of thevalve.

: The valve shown in the drawing and embodying the invention comprises aseat ring i seated in the opening 2 in the pump body 3. The opening 2and the periphery of the ring i are tapered to form a tight joint whichis supplemented by a packing ring 4 so that a seal between the ring 7and body is assured.

The upper end of the ring I is beveled at 5 to serve a function thatwill presently appear. The lower portion of the seat ring is providedwith a spider 5 comprising arms 1 terminating cen- I the surface 28thereof.

support the flexible ring. It seems apparent that bly just described ismaintained as a unitary composite structure. 'A fibre ring 21' .may beprovided in the nut 2| to prevent the nut from loosening on the threads20. v

The flange it may be provided with indenta- I plugs determining thespacing of the parts which confine the inner portion of the packing ring[1.

outwardly of the peripheral edge of the flange I6 the packing ringterminates in an annulus 19 of thickened cross section having a nethertapered face 2'! to engage the surface 5 on the seat ring. The face 21and the surface 28 on the wear plate l8 lie in substantially the sameconical surface so that the engagement of such surfaces with the surface5 serves respectively to form a seal between the valve and seat and toarrest movement of the valve assembly. The wear plate I8 is cut awayperipherally to form the surface 3| which forms an angle greater thanwith This shoulder serves to this construction is such as to provide apair of replaceable surfaces. One of these surfaces 21 on the ring i1 isflexible to seal and the other 28 on the retainer plate 22 takes thethrust of stopping the valve. Thus, all the wearable parts guide member(not shown) so that axial move ment of the valve is assured.

The lower stem I3 is of a diameter to receiv a replaceable hardenedguide sleeve 40 of which,

the upper end engages a shoulder 41' on the stem beneath the threads 20.A groove 42 in the lower end of the stem l3 receives a spring snap ring43 which holds the sleeve 40 in place.

In the operation of the valve embodying the invention the valve 10 movesupwardly, as is well known, to admit fluid through the seat ring I. Asthe valve moves downwardly to closed position to prevent reverse flow,the annulus I9 moves into engagement with the uppermost portion of thesurface 5 on the seat ring I. Substantially simultaneous with thisengagement the surface 28 on the wear plate l8 engages the lower por--tion of the seating surface 5, thus assuming the shock incident to thetermination of movement of the valve and the pressure of fluidthereagainst. Such latter engagement also completes the formation of theannulargroove into which the annulus portion 19 of the packingring l'lfits. Fluid bearing against the annulus l9 effects an eflicient sealthat prevents any leakage of fluid through the valve.

The principal parts of the device subject to destructive effects when inuse are the bushings 38 and 40, the packing ring l1, and the wear plate18. Obviously, any or all of these parts can be replaced or repairedwithout complete replacement of the valve. A particular advantage of theinvention described in the illustrated embodiment resides in theconflguration'of parts whereby the annulus l9 provides an efiective sealwithout undue destructive effects thereon. The invention hence providesa simple construction in which worn parts are readily replaceable andmovement of the valve is terminated by a wear plate which cooperateswith a packing ring to form an effective seal between the valve and itsseat. I

Broadly, the invention comprehends a novel valve construction in whichthe valve stopping and sealing areas which are most subject to wear arereplaceable when worn.

What is claimed is:

1. A valve including a tapered seat, a body having a main portion and a.flange extending outwardly therefrom and overlying an inner portion onlyof said seat, an annular packing gasket surrounding said main portionand having a sealing annulus extending outwardlybeyond said flange tooverlie the outer portion of said tapered seat, and a wear plateclamping said gasket in engagement with said flange, the outer surfacesof said gasket and said wear plate comprising contiguous downwardlytapering surfaces adapted to engage said seat, and a retainer platecarried by said body to clamp said wear plate and said gasket againstsaid flange.

2. A slush pump valve assembly including a stem, a flange integraltherewith, a stepped under surface on said flange, a packing ringengaging the under side of one of the steps of said flange so as toproject therefrom, a wear plate beneath and engaging said ring andextending outwardly of said flange to support said ring against thepressure being valved, sealing and seating faces on said ring and platerespectively which lie in the same conical surface to engage a valveseat, a retainer plate engaging another stepped area on the flange andarranged to retain said ring and wear plate, and a nut threaded on thestem to clamp said retainer plate to the stem.

3. A slush pump valve assembly including a stem, a flange integraltherewith, a stepped under surface on said flange, a packing ringengaging the under side of said flange and projecting therefrom, a wearplate beneath and engaging said ring, sealing and seating faces on saidring ,and plate respectively which lie in the same conical surface toengage a valve seat, a retainer plate engaging the stepped area on theflange and arranged to retain said ring and wear plate, a nut threadedon the stem to clamp said retainer plate to the stem, and replaceablewearresistant bushings carried by said stem above and below said flange.

CARL M. ANDERSON.

